Once connected, Cascade can pull data from your Quadratic sheets, write formulas, run Python and SQL, and build charts — directly inside Windsurf, alongside your code.
How to add Quadratic MCP to Windsurf
- 1
Open Cascade
In Windsurf, open the Cascade panel (Right-hand side by default). Click the Plugins icon (hammer) in the top-right of Cascade, or go to Windsurf Settings → Cascade → MCP Servers. - 2
Click "View raw config"
In the MCP Servers section, click Configure or View raw config. This opens ~/.codeium/windsurf/mcp_config.json in your editor. - 3
Add the Quadratic server to mcp_config.json
Paste the snippet below into the file. If you already have other MCP servers, merge the quadratic entry into your existing mcpServers block.~/.codeium/windsurf/mcp_config.json{ "mcpServers": { "quadratic": { "serverUrl": "https://mcp.quadratichq.com/" } } } - 4
Save the file
Save mcp_config.json. Windsurf picks up changes on the fly, but a full restart of Windsurf guarantees the server is loaded. - 5
Refresh Cascade and authorize
Back in Cascade, click the refresh icon on the MCP toolbar. Windsurf will prompt you to sign in to Quadratic via OAuth the first time a tool is called. Approve access. - 6
Use Quadratic in Cascade
Ask Cascade anything about your sheets. Try: "Using Quadratic, summarize the trends in my Q3 sales sheet." Cascade will call the Quadratic MCP server, pull the data, and respond inline.
Prefer the URL-only setup?
If you're editing the config manually in a codebase or sharing it with a team, the only value you need is the Quadratic MCP server URL. Copy it below.
MCP server URL
Windsurf + Quadratic MCP FAQs
Where is the Windsurf MCP config file located?
On macOS and Linux it’s at ~/.codeium/windsurf/mcp_config.json. On Windows it’s at %UserProfile%\.codeium\windsurf\mcp_config.json. Windsurf creates the ~/.codeium/windsurf/ directory the first time it launches.
Why does Windsurf use serverUrl instead of url?
Windsurf’s MCP config uses serverUrl for remote HTTP servers (the equivalent of url in most other clients). Using the wrong key is the most common reason a Windsurf MCP server fails to connect.
Can I use Quadratic MCP in Windsurf on a team?
Yes. Team admins can whitelist the Quadratic MCP server or add it to a custom MCP registry so every teammate gets it automatically. See Windsurf’s team admin docs.
My MCP server shows up but tools aren’t appearing.
Restart Windsurf completely, then click the refresh icon in the MCP toolbar. Check ~/.codeium/windsurf/logs/ if tools still don’t appear — most failures come from using url instead of serverUrl in mcp_config.json.
What is the Quadratic MCP URL?
The Quadratic MCP server is hosted at https://mcp.quadratichq.com/. Paste this URL into your Windsurf MCP configuration.
Is Quadratic MCP free?
Yes. Quadratic MCP is included with every Quadratic plan, including the free tier. You only need a Quadratic account and a supported AI client.
Is it secure?
Yes. Quadratic MCP uses OAuth 2.0 to authenticate each AI client with your Quadratic account. Your AI only sees files and data you already have access to, and you can revoke any connected client at any time in Quadratic settings.
What can I do with Quadratic MCP in Windsurf?
Once connected, Windsurf can read values from your Quadratic sheets, write cells and formulas, run Python and SQL, and build charts. Ask Windsurf any question about your spreadsheets the same way you’d ask about a PDF or URL.
Which other AI clients support Quadratic MCP?
Cursor, VS Code, Claude, ChatGPT, and Windsurf all work with Quadratic MCP today, plus any other client that supports remote Streamable HTTP MCP servers. See the full list.
